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提出了一种基于局域共振的开口空心球(spilt hollow spheres,SHS)模型,数值计算和声学透射实验结果表明基于该模型的声学超材料可以实现负的弹性模量.为了说明SHS的局域共振性质,研究了微结构SHS几何尺寸(例如开口孔径d和空心球直径D)变化时材料的透射性质,结果表明SHS的几何尺寸的改变对声学超材料的透射吸收峰频率有显著影响.另外,还研究了SHS不同排列方式对透射行为的影响,发现单层样品中SHS单元数目以及晶格常数的变化不会引起谐振频率的变化,但是随着SHS单元数目或者样品排列层数的增加,材料的谐振强度可以得到明显增强.
A SHS model based on local resonance was proposed. The numerical calculation and acoustic transmission experiment show that the acoustic metamaterial based on this model can achieve a negative elastic modulus.In order to illustrate the local area of SHS The resonant properties of the microstructures SHS were investigated. The transmission properties of the SHS microspheres were investigated when the geometrical dimensions of SHS changed (such as the opening diameter d and the hollow sphere diameter D). The results showed that the change of SHS geometry had a significant influence on the transmission absorption peak frequencies of the acoustic metamaterials. The effects of different SHS arrangements on the transmission behavior were also investigated. It was found that the number of SHS units and the lattice constant in single-layer samples did not change with the resonant frequency. However, with the increase of the number of SHS units or the number of layers arranged, The resonant strength of the material can be significantly enhanced.